Power assisted lipoplasty

ABSTRACT

Devices with a motor that, when connected to a cannula, rotates the cannula while removing adipose tissue from a surgical site. The device provides a direct pathway, for aspirated adipose tissue, from a tip of the cannula to a location where tubing is attached to the device. The pathway does not pass through the motor that provides the angular rotation of the cannula. Instead, the path for the adipose tissue passes through a removable coupler that is connected to the cannula. The cannula may also have a direct flow path for adipose tissue that does not pass through the motor.

BACKGROUND

Embodiments of the present invention relate generally to medical methodsand devices. In particular, embodiments relate to methods and devicesfor use in power assisted lipoplasty.

Lipoplasty is a medical procedure that involves removal of adiposetissue from a human patient. There are several different types oflipoplasty procedures that have particular steps for making the removalof the adipose tissue more efficient, effective, or safe. For example,ultrasonic assisted lipoplasty (UAL) utilizes ultrasonic energy. In UAL,a surgical site, with adipose tissue, is first infiltrated with aninfiltrate solution. After infiltration, ultrasonic energy is applied tothe surgical site using a probe that conducts ultrasonic energy. Afterthe ultrasonic energy has been applied to the surgical site, the adiposetissue is then aspirated (removed using a vacuum).

Power assisted lipoplasty is another type of lipoplasty procedure. Powerassisted lipoplasty procedures involve the use of mechanical movementduring aspiration of adipose tissue from a surgical site. Power assistedlipoplasty may be combined in some cases with aspects of UAL. Powerassisted lipoplasty is typically performed using a cannula that movesduring aspiration. For example, MicroAire, of Charlottesville, Va.manufactures a device for use in power assisted lipoplasty. TheMicroAire device is a cannula that moves back and forth along a centeraxis of the cannula, i.e., with a “jack hammer” like movement, duringaspiration. Such devices are not ideal because inexperienced users maypuncture muscle tissue or skin if they move the cannula too close to theskin layer or muscle layer.

Another company Kolster Methods Inc., (KMI) of Corona, Calif. sells acannula for use in power assisted lipoplasty that rotates about thecenter axis of the cannula. This is an improvement because the movementis angular instead of axial. In the device that KMI sells, the flow pathof adipose tissue being aspirated passes through the motor. The devicemust be autoclaved after each use. The motor in the KMI device degradesin the autoclave and thus cannot be used for very many procedures as aresult of premature failure. KMI also owns U.S. Pat. Nos. 6,638,238 and6,875,207 that generally describe a device that is powered by vacuumenergy, the vacuum also being used to aspirate tissue. What is needed isa device that provides movement during aspiration of adipose tissue froma surgical site but does not have axial movement and may be used arelatively large number of times.

SUMMARY

This summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailDescription section. This summary is not intended to be used as an aidin determining the scope of the claimed subject matter.

Described are embodiments that include a device with a motor that isconfigured to rotate a cannula while removing adipose tissue from asurgical site by aspiration. The rotational movement, which is poweredmechanically rather than by a vacuum, assists in removing the adiposetissue from the surgical site. Additionally, the device provides adirect pathway, for aspirating adipose tissue, from a tip of the cannulato a location where tubing is attached. The pathway does not passthrough the motor that provides the angular rotation of the cannula.Instead, the path for the adipose tissue passes through a removablecoupler that is connected to the cannula. The cannula includes a firstgear that is connected to a second gear that is rotated by the motor.This allows the cannula to rotate but also have a direct flow path foradipose tissue that does not flow through the motor. In embodiments, theflow path is also used for infiltrating tissue with fluids. Inembodiments, the motor is rated for autoclave sterilization andtherefore may be sterilized a large number of times before degrading.

BRIEF DESCRIPTION OF THE DRAWINGS

Non-limiting and non-exhaustive embodiments are described with referenceto the following figures.

FIG. 1 illustrates a side perspective view of a device used in powerassisted lipoplasty designed consistent with an embodiment of thepresent invention.

FIG. 2 illustrates a side perspective view of a handpiece of the deviceshown in FIG. 1.

FIG. 3 illustrates a side perspective view of the handpiece shown inFIG. 2 with a motor and a removable coupler of the handpiece separated.

FIG. 4 illustrates a top perspective view of the cannula hub andremovable coupler of the handpiece shown in FIG. 2.

FIG. 5 illustrates a side perspective view of the handpiece shown inFIG. 2 without the outside shell 110, or hub 112.

FIG. 6 illustrates a side exploded view of the handpiece shown in FIG. 2without the outside shell 110, or hub 112.

FIG. 7 illustrates a side perspective view of the removable coupler 108connected to the cannula showing the direct path provided for flow ofadipose tissue.

FIG. 8 illustrates a cross-sectional view of the removable coupler 108cross-sectioned parallel to a central axis of the removable coupler 108.

FIG. 9 illustrates a cross-sectional view of an embodiment of aremovable coupler that includes channels for controlled venting.

FIG. 10 illustrates a system for aspiration and infiltration thatimplements the device 100 of FIG. 1.

FIG. 11 illustrates a side perspective view of a second embodiment of ahandpiece.

FIG. 12 illustrates a side perspective view of the handpiece shown inFIG. 11 exposing the interior of the handpiece.

FIG. 13 illustrates a rear perspective view of the handpiece shown inFIG. 11 showing the channel within the housing when the removable coupleis removed.

FIGS. 14A-C illustrate another embodiment of a coupler and cannula thatmay be used for infiltration of adipose tissue.

FIGS. 15A and 15B illustrate a portion of a patient's body before andafter adipose tissue is removed, e.g., aspirated.

FIG. 16 illustrates embodiments of different angular rotations of acannula when aspirating adipose tissue from different locations in apatient.

DETAILED DESCRIPTION

Various embodiments are described more fully below with reference to theaccompanying drawings, which form a part hereof, and which show specificexemplary embodiments for practicing the invention. However, embodimentsmay be implemented in many different forms and should not be construedas limited to the embodiments set forth herein; rather, theseembodiments are provided so that this disclosure will be thorough andcomplete, and will fully convey the scope of the invention to thoseskilled in the art. Embodiments may be practiced as methods, systems ordevices. Accordingly, embodiments may take the form of a hardwareimplementation, an entirely software implementation or an implementationcombining software and hardware aspects. The following detaileddescription is, therefore, not to be taken in a limiting sense.

Described are embodiments that are useful for removing tissues andfluids from patients using a rotating cannula. In some embodiments, therotation of the cannula effects fragmentation (e.g., break up) oftissues that are then removed by aspiration through the cannula. In onespecific embodiment, the device is used in Power Assisted Lipoplasty(PAL) for fragmenting and removing tissue from a surgical location.Although the description below focuses on the use of embodiments in PAL,other embodiments are not limited thereto. The description of theembodiment for use in PAL is provided for illustrative purposes only.

FIG. 1 illustrates a side perspective view of a device 100 used in powerassisted lipoplasty designed consistent with an embodiment of thepresent invention. As shown in FIG. 1, device 100 includes a cannula 102with perforations 102A. Adipose tissue is aspirated from a surgical siteby being drawn into perforations 102A and channel 103 of cannula 102when a vacuum is applied. Cannula 102 is used to provide a pathway forremoving adipose tissue from a surgical site to a collection containerand to provide a pathway for infiltration fluid delivered to a surgicalsite from a container.

Device 100 also includes a handpiece 104 that is used by a user tomanipulate cannula 102 within a surgical site inside a patient.Handpiece 104 includes a motor 106 that provides the mechanical movementof cannula 102. In particular, motor 106 rotates cannula 102 in aclockwise and/or counter clockwise direction(s) shown by arrows 108. Therotation assists in fragmenting, e.g., breaking up, adipose tissue at asurgical site, which can then be aspirated through the cannula. Thedegree of rotation of the cannula depends on the actual implementation.In some embodiments, the cannula 102 may rotate more than about 90degrees (90°), more than about 180° or even more than about 360° in onedirection (e.g., clockwise) followed by movement of more than about 90°,more than about 180° or even more than about 360° in the other direction(e.g., counter clockwise). However, in other embodiments the cannula 102may rotate less than about 360° in at least one direction beforechanging directions and rotating less than about 360° in the otherdirection. As those with skill in the art will appreciate, motor 106 maybe configured to rotate cannula 102 any desired amount in differentdirections.

Motor 106 is also configured to rotate cannula 102 at differentrotational speeds ranging from about 50 revolutions per minute (rpm) toabout 500 rpm. In one embodiment, the speed of the cannula ranges fromabout 100 rpm to about 420 rpm and motor 106 is configured to beadjusted in increments of about 80 rpm. For example, the motor 106 maybe set to rotate the cannula at about 100 rpm, about 180 rpm, about 260rpm, about 340 rpm, or about 420 rpm. This is merely one embodiment andmotor 160 may be adjusted in any increments, in other embodiments.

FIG. 2 illustrates a side perspective view of the handpiece 104 of thedevice 100 shown in FIG. 1. Shown in FIG. 2 is removable coupler 108that is part of handpiece 104. Coupler 108 is connected to cannula 102and provides a pathway for adipose tissue that is aspirated from thesurgical site or for infiltration fluid delivered to a surgical site.Hub 112 covers the connection between cannula 102 and coupler 108. Alsoshown in FIG. 2 is housing 110 which partially covers motor 106 and alsoprovides a portion of the mechanism for connecting motor 106 toremovable coupler 108. In the embodiment shown in FIG. 2, housing 110includes an opening 110 a that exposes at least a portion of the motor106.

FIG. 3 illustrates the features of housing 110 that are used to connectmotor 106 to removable coupler 108. As shown in FIG. 3, housing 110includes a number of channels 114 that engage tabs on removable coupler108. Channels 114 include openings 114 a that allow tabs to be initiallypositioned within the channels 114. The tabs can then be slid andsecured within channels 114. FIG. 4 illustrates a top perspective viewof the removable coupler 108 and cannula hub and shows the tabs 116 thatare positioned within the channels 114 and used to engage coupler 108with housing 110. It should be understood that the mechanism shown inFIGS. 3 and 4 for connecting the removable coupler 108 with the motor106 is presented merely for illustrative purposes. Any mechanism thatconnects motor 106 to removable coupler 108 yet still allows removablecoupler 108 to be separated from motor 106 may be used with the presentinvention. In some embodiments, there may not be a housing such ashousing 110, and instead motor 106 may include other features andmechanisms, such as bracket, fasteners, and/or clamp, for connectingmotor 106 to removable coupler 108. FIGS. 11-13, described below,illustrate an alternative embodiment for connecting a coupler to amotor.

FIG. 5 illustrates a side perspective view of the handpiece 100 shown inFIG. 2, without the outside shell 110 or hub 112. FIG. 5 illustratesfeatures of embodiments of the present invention. As shown in FIG. 5motor 106 is located on the side of coupler 106 and cannula 102, yetstill rotates cannula 102. In this design, the flow path for the adiposetissue is through cannula 102 and removable coupler 108. The pathwaydoes not pass through motor 106. This design is distinct from availabledevices in which the flow path for the adipose tissue passes through themotor that rotates the cannula. As shown in FIG. 5, a center axis 107 ofmotor 106 does not coincide with a center axis of removable coupler 109,which is also the center axis of cannula 102 when connected to coupler109. In embodiments, center axis 107 is substantially parallel to axis109. In other embodiments, axis 107 may not be substantially parallel toaxis 109 as shown in FIG. 5 but may be positioned at some angle relativeto axis 109. However, even in these embodiments, axis 107 does notsubstantially coincide with the flow path of adipose tissue removed froma surgical site. As previously noted, the flow path is also used inembodiments for delivering infiltration fluid to a surgical site.

In embodiments, motor 106 is an electric motor. Use of an electric motoras motor 106 may provide improvements over other devices that use vacuumdriven motors. Electric motors are more reliable, more user friendly,and are easier to miniaturize to fit within a handpiece.

FIG. 6 illustrates a side exploded view of the handpiece shown in FIG. 5without the outside shell 110 and with hub 112. FIG. 6 illustrates thecomponents used to transfer the motion from motor 106 to the cannula102. Motor 106 includes a shaft 106 b which rotates. Connected to shaft106 b is gear 118 which engages gear 120. Gear 120 is connected tocannula 102. Gears 118 and 120 transfer the rotational motion of shaft106 b of motor 106 to cannula 102. It is noted that although FIG. 6illustrates only two gears, other embodiments may include morecomplicated designs with additional gears, shafts, pulleys, or othermechanical components for transferring motion from motor 106 to rotationof a cannula. In one embodiment, gear 118 is connected to additionalcomponents which then transfer the movement of gear 118 to gear 120.

Also shown in FIG. 6 are ergonomic features that are incorporated intoportions of the handpiece 104. For example, motor 106 includes anoutside surface 106 a that may be molded with material such as siliconeto allow a user to more comfortably grip handpiece 104. Additionally,the molded material may have some ornamental features. Removable coupler108 also includes indentations 108 a that can accommodate the fingers ofa user. The indentations 108 a can be customized or standardized.Outside surface 106 a and indentations 108 a are merely some examples ofergonomic features that may be incorporated into handpiece 100. Thosewith skill in the art will appreciate that additional features may beadded in other embodiments.

FIG. 6 also shows is a grove 119 on the back end of cannula 102. Groove119 in embodiments is used to secure an o-ring onto cannula 102. Theo-ring helps to provide a seal between the cannula 102 and a channel 130of removable coupler 108, helping to maintain a vacuum.

In some embodiments, the motor 106 may include a swivel mechanism atlocation 127 that allows the motor 106 to rotate with respect to thecable. This is useful so that a user does not have to work against theresistance of the cable when manipulating the handpiece, which reducesthe strain on a users hand or wrist. The removable coupler may alsoinclude a swivel mechanism at location 123 that also allows the couplerto rotate with respect to tubing connected to the coupler 108. This alsoreduces the strain on a user.

FIG. 7 illustrates a side perspective view of the removable coupler 108connected to the cannula showing the direct path provided for flow ofadipose tissue. One feature of embodiments of the present invention isthe ability to provide a direct path from a tip 124 of the cannula 102where adipose tissue enters the cannula 102 to a location 126 wheretubing that provides the vacuum is connected to the handpiece. FIG. 7illustrates the flow of adipose tissue in the direction noted by arrow128. As shown in FIG. 7 there is a direct path from tip 124 to location126. When coupler 108 is connected to cannula 102, channel 103 ofcannula 102 is substantially collinear with a channel 130 (FIG. 8) ofcoupler 108. It is noted that in some embodiments, the channel 103 ofcannula 102 or the channel 130 of the removable coupler 108 may not besubstantially straight, but may include some curves or twists. In thoseembodiments in which coupler 108 and cannula 102 are used to deliverinfiltration fluid to a surgical site, the flow of fluid is opposite thedirection noted by arrow 128.

A handpiece with a flow path that does not pass through motor 106provides a number of improvements over handpieces in which the flow pathof adipose tissue (or infiltration fluid) does pass through a motor. Asone example, a leak in the portion of the flow path that passes throughthe motor can damage the motor, which requires replacement of the entirehandpiece. Also, leaks in the portion of the flow path that passesthrough the motor are not easily repaired. Thus, even if the leaks donot immediately damage the motor, the handpiece may need to be replacedbecause of the difficulty in repairing the leaks or breaks in theportion of the flow path that passes through the motor. In contrast,having the flow path pass through the removable coupler 108, allows easyreplacement of the removable coupler in the event of any leaks orbreaks. Also, the motor 106 can be sealed so that any fluid that leaksfrom a broken coupler does not enter the motor 106.

As those with skill in the art will appreciate, some lipoplastyprocedures involve not only removing adipose tissue from the surgicalsite but reintroducing adipose tissue to other surgical sites within apatient. In these instances, it is important not to damage the cellswithin the adipose tissue so that they may survive when introduced intothe patient. FIG. 8 illustrates a feature of some embodiments that helpsto preserve the adipose tissue that is removed from the surgical site.FIG. 8 illustrates a cross-sectional view of the removable coupler 108cross-sectioned parallel to a central axis of the removable coupler 108.As can be seen in FIG. 8, removable coupler 108 includes a centralchannel 130 that provides the pathway for adipose tissue. When coupler108 is connected to a cannula such as cannula 102, channel 130 issubstantially collinear with the channel 103 of cannula 102 (see FIG.7). As shown in FIG. 8, channel 130 is in embodiments tapered. That is,the diameter 132 at one end of channel 130 is less than the diameter 134at a second end of channel 130. The taper of channel 130 reduces thevelocity of the adipose tissue as it flows through channel 130 acrossthe length of the removable coupler 108. The reduction in velocity mayhelp to reduce damage that is done to the cells as they flow throughcoupler 108. The adipose tissue may then provide better results whenintroduced into a patient. FIG. 8 also shows a cavity 136 where thecannula 102 is connected to the removable coupler 108.

FIG. 9 illustrates a cross-sectional view of an embodiment of aremovable coupler 140 that includes channels for controlled venting. Theremovable coupler 140 includes a cavity 142 (similar to cavity 136 ofcoupler 108) where a cannula can be connected to the removable coupler140. For example, cannula 102 with groove 119, and an o-ring positionedwithin groove 119, can be positioned within cavity 142. Along theinterior walls of cavity 142 are venting channels 144 that allow air toflow between the interior walls of cavity 142 and a cannula that ispositioned within cavity 142. The venting channels 144 are designed toallow a certain amount of air to flow between the interior walls ofcavity 142 and a cannula or an o-ring on the cannula. This controlledventing allows continual flow along a pathway between a surgical siteand a collection container for collecting adipose tissue removed fromthe surgical site. Even if adipose tissue blocks the pathway upstream ofthe vents, the venting feature allows a continual flow of material fromthe surgical site to the collection container. As those with skill inthe art will appreciate, the combination of venting and a rotatingcannula is not found in conventional devices. As can be appreciated, toprovide different amounts of venting, venting channels 144 may be ofdifferent dimensions, and a coupler may include one or more ventingchannels 144.

FIG. 10 illustrates a system 200 in accordance with one embodiment ofthe present invention. System 200 uses the device 100 of FIG. 1. System200 also includes a console 202 that is connected to the motor 106 ofdevice 100. The console 202 may include a number of components thathelps drive motor 106. For example, console 202 may include a powersupply 204 as well as logic 206 for sensing and controlling the amountand direction of rotation of cannula 102. In some embodiments, logic 206may be hardware or may include aspects of hardware and software. Forexample in one embodiment logic 206 includes a processor that executesinstructions implemented in software. The software is stored in a memory205 within console 202. The logic 206 can provide precise control overthe speed and angular rotation of the cannula 102. The logic 206 can beprogrammed to change the speed and the amount of rotation based onvarious factors including, but not limited to, the specific procedurebeing performed (e.g., infiltration or aspiration), the location of thesurgical site, the amount of adipose tissue that will be aspirated, theamount of fluid being used to infiltrate a surgical site, or the type offluid used to infiltrate a surgical site. This control is distinct fromother devices that use a stepper motor that does not require logic tocontrol the rotation of cannula, e.g., an open loop embodiment.

In embodiments, console 202 may provide controls that allow a user toenter settings for the rotation of the cannula. For example, console 202may include: knobs, buttons, dials, LCD display(s) or other controlsthat allow a user to enter settings to control logic 206 and ultimatelythe speed and angle of rotation of cannula 102.

System 200 also includes a pump 214 that creates a vacuum withincollection container 214. The vacuum created by pump 214 creates avacuum within tubing 210, which is connected to the removable coupler108. The vacuum draws the adipose tissue from the surgical site throughcannula 102, coupler 108, tubing 210 and into container 214. The adiposetissue may be store within container 214 until disposed of or furtherprocessed for reintroduction into a patient. The vacuum is not used inany way to affect rotation of the cannula.

In some embodiments, system 200 may be used for infiltration as well asaspiration. In these embodiments, system 200 will include optionalinfiltration system 216, which includes tubing 218 connected to a pump220. Pump 220 when operated pumps infiltration liquid from reservoir 222through tubing 224, tubing 218, tubing 210, removable coupler 108, andcannula 102 to the surgical site. A valve 225 may be used to ensure thatinfiltration liquid does not enter the aspiration system. In theseembodiments, cannula 102 may be rotated during infiltration of thesurgical site. The rotation of cannula 102 may be in directions andamounts that are different than the rotation of cannula 102 duringaspiration. In other embodiments, the rotation of cannula 102 may be thesame during infiltration and aspiration.

FIG. 11 illustrates a side perspective view of a second embodiment of ahandpiece 304 according to the present invention. Handpiece 304 alsoincludes a removable coupler 308. Handpiece 304 includes a housing 310that covers a majority of a motor 306 and a majority of the removablecoupler 308. As shown in greater detail in FIGS. 12 and 13, removablecoupler 308 is positioned within a channel 312 (FIG. 13) of housing 310.FIG. 12 illustrates a side perspective view of the handpiece 304 with aportion of housing 310 missing to expose the interior of the handpiece304. FIG. 13 illustrates a rear perspective view of the handpiece 304showing the channel 312 when removable coupler 308 is not positionedwithin the channel 312.

As shown in FIG. 12, handpiece 304 includes a motor 306 positionedwithin housing 310. The removable coupler 308 is also positioned withinhousing 310 in channel 312. The removable coupler 308 can be insertedinto, and removed from, channel 312, and when positioned within channel312 is mechanically secured within channel 312. For example, removablecoupler 308 may include one or more ridges along its length that fitwithin grooves in channel 312. As another example, the removable coupler308 may include o-rings that contact the interior surface of channel 312to secure coupler 308 within the channel. These are merely someexamples, and any mechanical features for securing coupler 308 inchannel 312 may be used. Coupler 308 also includes some anti-rotationfeatures. As shown in FIG. 12, coupler 308 has a flat surface 316 on thetop and another flat surface (not shown) on the bottom. The top surface316 may contact portions of channel 312 and portions of motor 306 toprevent it from rotating when a cannula connected to coupler 308 isbeing rotated by motor 306.

As can be appreciated by the above description, removable coupler 308can be easily replaced if there is a break or leak in coupler 308. It iseasily removed and replaced. In some embodiments, different couplers maybe used with the same handpiece 304. For example, a first coupler may beused when handpiece 304 is used for infiltration of adipose tissues. Thefirst coupler may include features that allow it to easily connect to aninfiltration system, or have other features that make it appropriate foruse in infiltration of adipose tissues (e.g., FIGS. 14a -14C). A secondcoupler with different features can then be used when aspirating tissuefrom a patient.

FIGS. 14A-14C illustrate an embodiment of a coupler 408 and a cannula402 that are used in some embodiments of the present invention forinfiltration of adipose tissue. FIG. 14A illustrates the coupler 408,FIG. 14B illustrates the cannula 402, and FIG. 14C illustrates thecannula 402 when connected to, and positioned within, coupler 408.

As shown in FIG. 14A, coupler 408 includes a channel 430 that is part ofa flow path for infiltration fluid. A coupling 450 is used to connectcoupler 408 to a source of fluid, such as infiltration system 216 (FIG.10). In the embodiment shown in FIG. 14A, coupler 450 has threads thatallow coupler 408 to connect to the source of infiltration fluid.Coupler 408 also includes a cavity 436 where at least a portion of acannula, such as cannula 402 connects to coupler 408. A hole 420 is alsoincluded in coupler 408. As described in greater detail below withrespect to FIG. 14C, the hole 420 allows infiltration fluid to escapethe coupler 408 if the cannula 402 is not sealed properly with thecoupler 408.

Referring now to FIG. 14B, the cannula 402 includes two hubs 452 and454. Each of hubs 452 and 454 includes features for creating a seal withcannula 402 and prevent infiltration fluid from leaking. Hub 452includes a grove 462 into which an o-ring 462 a is positioned. Hub 454includes grooves 456, 458, and 460. As shown in FIG. 14C, o-rings 456 a,458B, and 460C are positioned in grooves 456, 458, and 460 respectivelyto create a seal between coupler 408 and cannula 402.

As shown in FIG. 14C, cannula 402 slides into channel 430 of coupler402. When connected to coupler 408, the o-ring 462 a contacts andcreates a seal with the inside surface of cavity 432. Also, o-rings 456a, 458 a, and 460 a contact the inside surface of channel 403 and alsocreate a seal. Hole 420 of coupler 408 is positioned between o-rings 458a and 460 a. The hole 420 allows any infiltration fluid that leaksaround o-rings 456 a and 458 a to escape and not leak into other areas,such a motor that may be connected to coupler 408.

As can be appreciated, the presence of the two hubs 452 and 454 providesa more robust connection between coupler 408 and cannula 402. Whencannula 402 is in use, a moment may be created about a connection pointbetween the coupler 408 and cannula 402. Having two hubs creates twoconnection points and makes it less likely that the connection, and theseal, between the coupler 408 and cannula 402 will fail.

Although the cannula 402 and coupler 408 are described as useful forinfiltration of adipose tissue, they may be used in embodiments foraspiration of adipose tissue. Features such as having two hubs are alsouseful when aspirating adipose tissue.

FIGS. 15A and 15B illustrates a portion of a patient's body includinglayers of skin 502, a subcutaneous layer of fat 504 from which theadipose tissue is removed, and some other anatomical layer 506 (e.g.muscle tissue). Although shown as distinct layers in the drawings, infact, layers such as 504 and 506 can be interdispersed particularly attheir boundary. In FIGS. 15A and 15B, the portion of layer 504 that isnear the skin 502 is labeled 504 a, while the portion that is deeper islabeled 504 b.

FIG. 15A shows an embodiment where no adipose tissue has yet beenremoved from a patient. FIG. 15B shows that adipose tissue has beenremoved from a patient's body. In particular, a volume of adipose tissuehas been removed from surgical site, location 508, which is in theportion of layer 504 labeled as 504 a, near skin 502. As a result ofhaving removed the volume of adipose tissue from location 5 Her08underneath the skin 502, an indentation 512 has formed on the surface ofskin 502. The indentation 508 is not dangerous, but is not aestheticallypleasing. To correct the indentation 512, a surgeon may need to performsome sculpting, i.e. pushing adipose tissue into location 508 as well asremove adipose tissue from surrounding areas near location 508, in orderto smooth out the indentation 512. This may prolong the procedure,increasing the time a patient must suffer through some discomfort. Ascan be appreciated, removing adipose tissue from locations deeper inlayer 504, such as portion 504 b, is less likely to cause artifacts onthe skin surface that affect the appearance of the skin.

In order to avoid creating artifacts on the skin surface, such asindentation 512 shown in FIG. 15B, embodiments of the present inventionare designed to prevent the removal of adipose tissue too close to skin502. Referring now to FIG. 16, two cross-sections of a cannula 516,perpendicular to a center axis of the cannula, are shown. Thecross-sections are through a perforation 518 in cannula 516. As can beappreciated, the adipose tissue is removed from a patient throughaspiration, namely by applying a vacuum within cannula 516 which causesthe adipose tissue to enter cannula 516 through perforation 518. Forpurposes of illustration, FIG. 16 also shows skin layer 502, and labels504 a and 504 b.

The top cross section shown in FIG. 16 illustrates the angle of rotationthat the cannula 516 will travel, in one embodiment of the presentinvention, when adipose tissue is being removed from portion 504 a oflayer 504. In other words, the surgical site is within portion 504 a. Asis shown, the cannula is limited in its rotation so that perforation 518is not allowed to go beyond about 90° from its original position 520 ineither clockwise or counterclockwise directions. This limitationprevents adipose tissue from being removed from a location that is tooclose to skin layer 502, thereby preventing formation of indentations onthe surface of skin 502. In these embodiments, the motor, e.g., motor106 or 306, that is rotating cannula 516 is set so that the rotation ofcannula 516 is no more than about 90° in either clockwise orcounterclockwise directions. As can be appreciated, in otherembodiments, the motor may be set to allow rotation beyond 90° such asabout 100° or about 110° but still limit the rotation to prevent adiposetissue from being removed from a location too close to skin 502.

In some embodiments, in addition to limiting the rotation of cannula516, the motor may also be configured to limit the rotational speed ofcannula 516 when removing adipose tissue from layer 504 a. The motor maybe set to lower speeds, such as from about 100 rpm to about 280 rpm sothat there is not as much energy being applied to the adipose tissuenear the skin 502. Also, the rate at which the adipose tissue is removedis slower when the cannula is rotated at lower speeds because theadipose tissue is not being fragmented as quickly. This allows a surgeontime to view the skin surface and ensure that it is being contoured asdesired by the surgeon. In embodiments, similar angles and speeds areused when infiltrating adipose tissue in portion 504 a of layer 504.

The bottom cross section shown in FIG. 16 illustrate the angle ofrotation that the cannula 516 will travel, in one embodiment of thepresent invention, when adipose tissue is being removed from portion 504b of layer 504. That is, the surgical site is within portion 504 b. Asis shown, the cannula 516 may rotate so that perforation 518 rotates360° from its original position 520 in either clockwise orcounterclockwise directions. When removing adipose tissue from portion504 b, which is deeper in layer 504, there is less risk of creatingindentations on the surface of skin 502; as a result the cannula 516 isallowed to rotate 360° to remove adipose tissue all the way aroundcannula 516. In these embodiments, the motor, e.g., motor 106 or 306,that is rotating cannula 516 is set so that the rotation of cannula 516is 360°, or more, in either clockwise or counterclockwise directions.

In addition to rotating the cannula 360°, the motor may also beconfigured to rotate cannula 516 at relatively higher speeds whenremoving adipose tissue from layer 504 b. The motor may be set tospeeds, such as from about 360 rpm to about 420 rpm, so that the adiposetissue is fragmented and removed relatively quickly. Removing adiposetissue more quickly from portion 504 b shortens the procedure time andmay allow a surgeon more time to sculpt the patient when removing tissuecloser to skin 502. In embodiments, similar angles and speeds are usedwhen infiltrating adipose tissue in portion 504 b of layer 504.

It is noted that the description of FIGS. 14A-15 is made forillustrative purposes only to show combinations of amount of rotationand speeds that a motor consistent with the present invention mayimplement. As indicated above, motors of the present invention may havea variety of settings for both the amount of rotation and the rotationalspeed. A surgeon can then decide the appropriate combination of amountand speed for a particular procedure.

Reference has been made throughout this specification to “oneembodiment” or “an embodiment,” meaning that a particular describedfeature, structure, or characteristic is included in at least oneembodiment. Thus, usage of such phrases may refer to more than just oneembodiment. Furthermore, the described features, structures, orcharacteristics may be combined in any suitable manner in one or moreembodiments.

One skilled in the relevant art may recognize, however, that theinvention may be practiced without one or more of the specific details,or with other methods, resources, materials, etc. In other instances,well known structures, resources, or operations have not been shown ordescribed in detail merely to avoid obscuring aspects of the invention.

While example embodiments and applications have been illustrated anddescribed, it is to be understood that the invention is not limited tothe precise configuration and resources described above. Variousmodifications, changes, and variations apparent to those skilled in theart may be made in the arrangement, operation, and details of themethods and systems disclosed herein without departing from the scope ofthe claimed invention

What is claimed is:
 1. A device for use in removing adipose tissue froma surgical site, the device comprising: a removable coupler configuredto be connected to a cannula so that a channel of the cannula and achannel of the removable coupler provide a pathway for flow of theadipose tissue from the surgical site; and a motor connected to theremovable coupler, wherein the motor includes a central axis and theremovable coupler includes a central axis that is offset from thecentral axis of the motor.
 2. The device of claim 1, wherein when theremovable coupler is connected to a cannula, wherein the channel of thecannula and the channel of the removable coupler are substantiallycollinear.
 3. The device of claim 1, further comprising: a gearconnected to the motor, wherein the motor rotates the gear at least 90°.4. The device of claim 3, wherein the motor rotates the gear clockwiseand counterclockwise.
 5. The device of claim 1, wherein the channel ofthe removable coupler is tapered.
 6. The device of claim 1, wherein thehousing comprises a channel and the removable coupler is positionedwithin the channel of the housing.
 7. The device of claim 1, wherein theremovable coupler has a surface that contacts a portion of the motor toprevent rotation of the removable coupler.
 8. The device of claim 1,wherein the removable coupler includes a plurality of features, and thehousing includes a plurality of features configured to engage thefeatures of the removable coupler for connecting the motor to theremovable coupler.